Hi and thanks for your help.
I brought a new psu and replaced it but it wasnt that.
It sounds a bit stupid now, I took all the parts out of my pc to check and realised that I had a 8th gen cpu in a 6-7th gen msi mobo. ( both 1151)
All worked fine for some time until the win.10 update.
I think now I just have to do my homework and find a good 8th gen mobo. For the cpu.